Flat plastic key with shortened key alignment groove

Details Flat plastic key with shortened key alignment groove Flat plastic key with shortened key alignment groove

1991-07-08

1993-04-13

Gall, Lloyd A.

Locks

Operating mechanism

Key

70407, 76110, 76DIG7, E05B 1904

Patent

active

052012034

ABSTRACT:
A flat plastic key suitable for replacing a corresponding metal key having a key alignment groove disposed in a side of the key is configured to actuate a rotary cylinder lock having a rectangular lock entrance slot. The plastic key includes a head, a shank and a bit. The shortened key alignment groove extends along the side of the key creating a decreased key thickness adjacent to the groove. The shortened groove terminates in the key shank at a groove termination point to define a groove length less than the corresponding groove length of the metal key to thereby increase the volume and strength of the plastic key shank relative to the volume and strength of an exact plastic duplicate of the metal key shank to increase the strength of the plastic key and its capacity to transfer the input torque to the sidewalls of the lock entrance slot.

REFERENCES:
patent: 2714304 (1955-08-01), Dedda
patent: 3324694 (1967-06-01), Tornoe
patent: 4162623 (1979-07-01), Yorio et al.

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